--- product_id: 48535372 title: "125mm to 100mm Round Duct Reducer | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics" brand: "kair" price: "€ 23.85" currency: EUR in_stock: true category: "Kair" url: https://www.desertcart.hr/products/48535372-125mm-to-100mm-round-duct-reducer-fits-over-fittings-bends store_origin: HR region: Croatia --- # Lightweight 41g plastic build 125mm to 100mm precision fit Push-fit compatible spigots 125mm to 100mm Round Duct Reducer | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics **Brand:** kair **Price:** € 23.85 **Availability:** ✅ In Stock ## Summary > 🔄 Upgrade your airflow game with the ultimate ducting adapter! ## Quick Answers - **What is this?** 125mm to 100mm Round Duct Reducer | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics by kair - **How much does it cost?** € 23.85 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/48535372-125mm-to-100mm-round-duct-reducer-fits-over-fittings-bends) ## Best For - kair enthusiasts ## Why This Product - Trusted kair brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Optimized Airflow:** Designed to maintain efficient ventilation for dryers, extractor fans, and cooker hoods. - • **Push-Fit Convenience:** 125mm female spigot fits over connectors for quick, tool-free installation. - • **Compact & Lightweight:** Slim 5.1cm profile and 41g weight ensure easy handling and minimal space usage. - • **Universal Compatibility:** Works flawlessly with Kair SYS-100 & SYS-125 ranges plus standard ducting systems. - • **Seamless Size Transition:** Effortlessly converts 125mm ducting to 100mm for versatile ventilation setups. ## Overview The Kair Straight Ducting Reducer/Adaptor (DUCVKC603) is a precision-engineered plastic fitting that converts 125mm ducting to 100mm, compatible with Kair’s SYS-100 and SYS-125 ventilation systems. Lightweight and easy to install with push-fit spigots, it ensures efficient airflow for tumble dryers, extractor fans, and kitchen ventilation, making it a must-have for professional-grade HVAC setups. ## Description Free delivery and returns on all eligible orders. Shop Kair Straight Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 125 mm to 100 mm Kair. ## Features - Adapter to convert 125mm to 100mm ducting - 5" to 4" - On one side there is a 125mm female spigot. Fits over push-fit connectors (bends, etc.) Requires an additional 125mm plug to connect round 125mm pipe. - On the other side there is a 100mm spigot. Fits in 100mm straight ducting - Compatible with 100mm and 125mm ducting systems, including the extensive Kair SYS-100 and SYS-125 range of fittings, sockets and grilles. - Perfectly suited for conducting your tumble dryer, bathroom or kitchen extractor fan, hydroponics, in-line fans or cooker hoods and other ventilation applications. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004X4S7QI | | Best Sellers Rank | 2,909 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Ducting | | Brand | Kair | | Colour | White | | Connector Type | Coupling, Plug, Reducer | | Country of Origin | United Kingdom | | Customer Reviews | 4.5 4.5 out of 5 stars (2,615) | | Item Dimensions | 5.1 x 5.1 centimetres | | Item Weight | 41 g | | Manufacturer | Kair | | Material | Plastic | | Model Number | DUCVKC603 | | Number of Pieces | 1 | | Part Number | DUCVKC603 | | Size | 125mm to 100mm | | Thread Size | 125mm, 100mm | ## Product Details - **Brand:** Kair - **Colour:** White - **Connector type:** Coupling, Plug, Reducer - **Item dimensions L x W x H:** 5.1 x 5.1 centimetres - **Item weight:** 41 g - **Material:** Plastic - **Number of Packs:** 1 - **Number of pieces:** 1 - **Size:** 125mm to 100mm - **Thread size:** 125mm, 100mm ## Images ![125mm to 100mm Round Duct Reducer | Fits over fittings (bends etc), For dryer vents and cooker hoods and extractor fans, Suitable for grow tents and hydroponics - Image 1](https://m.media-amazon.com/images/I/415Hw3eWTlL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Is this a one piece adaptor (150mm>100mm) or two pieces together (150mm>125mm then 125mm>100mm)?** A: It was over a year ago, however from memory it was a one piece adapter which I used for an over the cooker extractor. Hope this is useful **Q: New extractor fan 120mm outlet. Existing flexible hose 100mm. Anything needed besides this and clip?** A: Not really. One end wedged onto my extractor fan and the other on the piping. I didn't have a clip so just used gaffa tape 😉 ## Frequently Bought Together - Kair Straight Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 125 mm to 100 mm Kair - Kair PVC Flexible Hose 125mm - 5 inch Universal Tumble Drier, Cooker Hood, Extractor Fan, Air Conditioner Hose - 3 Metre Length - 125mm Pack of 2 Adjustable 120-140mm Stainless Steel Pipe Clamp Secure Hose Clip Inline Duct Extractor Fan Cooker Hood --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/48535372-125mm-to-100mm-round-duct-reducer-fits-over-fittings-bends](https://www.desertcart.hr/products/48535372-125mm-to-100mm-round-duct-reducer-fits-over-fittings-bends) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-21*